I have everything setup to my liking, but the last thing I need accomplish the task of being able to watch tv through mythtv. I currently have a video card displaying output to my tv through s-video. Everything there is working fine.

Then I have a TV card, the hauppage pvr-500, thats hooked up. I installed the ivtv drivers in Ubuntu and made sure everything was setup before installing linuxmce. This tv card has composite audio/video cables connected to the composite input on the tuner and (i believe) the other end is connected to the composite out on my tv. I'm not sure how I'm supposed to go about setting it up in linuxmce so I can watch tv, record, etc.

i'm completely lost on this. is there a way i can remove and reconfigure my tv card or something? i'm not sure if everything is setup correctly or not.

Start by my running the Mythtv-setup from inside the Orbiter: Advanced->Computing->MythTV Setup. That will allow you to configure your capture card. To schedule recordings you can either do it from MythWeb or using the mythfrontend.